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Description
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test
Is this a regression?
- Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was
No response
Description
When testing a component that uses @defer (on timer(2s)), switching the tests to use AoT makes the test fails.
Minimal Reproduction
Generate a new app with latest CLI and add a component:
npx @angular/cli@20.0.0-next.9 new defer-aot-repro --defaults --no-routing
cd defer-aot-repro
ng g c user
Use app-user in app.html:
@defer (on timer(2s)) {
<app-user />
}Change the test to:
import { fakeAsync, TestBed, tick } from '@angular/core/testing';
import { App } from './app';
describe('App', () => {
beforeEach(async () => {
await TestBed.configureTestingModule({
imports: [App],
}).compileComponents();
});
it('should render user', fakeAsync(() => {
const fixture = TestBed.createComponent(App);
fixture.detectChanges();
tick(2000);
const compiled = fixture.nativeElement as HTMLElement;
expect(compiled.querySelector('p')?.textContent).toContain('user works');
}));
});Run:
ng test --no-watch --code-coverage
Tests are OK 👍
Edit angular.json to add "aot": true in the test section and run:
ng test --no-watch --code-coverage
The test is failing:
Chrome Headless 135.0.0.0 (Mac OS 10.15.7) App should render user FAILED
Expected undefined to contain 'user works'.
Exception or Error
Your Environment
Angular CLI: 20.0.0-next.9
Node: 22.14.0
Package Manager: npm 10.9.0
OS: darwin arm64
Angular: 20.0.0-next.9
... build, cli, common, compiler, compiler-cli, core, forms
... platform-browser, router
Package Version
------------------------------------------------------
@angular-devkit/architect 0.2000.0-next.9
@angular-devkit/core 20.0.0-next.9
@angular-devkit/schematics 20.0.0-next.9
@schematics/angular 20.0.0-next.9
rxjs 7.8.2
typescript 5.8.3
zone.js 0.15.0
Anything else relevant?
No response
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Issues related to the framework runtimeIssues related to the framework runtimeIssues related to Angular testing features, such as TestBedIssues related to Angular testing features, such as TestBed